Multiple-needle hemstitching mechanism



Feb. 20, 1923. 1,445,956; H. A. JACOBS ET AL. I

MULTIPLE NEEDLQHEMSIITCHING MECHANISM. I

HLEbNOV. 24, 1920- 4 SHEETSSHEET-l.

jaywez'mi aomga Feb; 20, 1923. 1,445,956. H. A. JACOBS ET AL.

MULTIPLE NEEDLE HEMSTITCHING MECHANISM.

FILED Nov. 24. 1920. 4 SHEETS-SHEET 2..

Fb. 20, 1923. 1,445,956. H A. JACOBS ET AL.

MULTIPLE NEEDLE HEMSTITCHING MECHANISM.

FILED NOV. 24' 1920. 4 HEETSSHEET 3.

Feb. 20, 1923; H. A. JACOBS ET AL.

MULTIPLE NEEDLE HEMSTITCHING MECHANISM.

4 SHEETS*SHEET 4.

FILED NOV. 24, 1920.

In: mmmm v II-film Patented Feb. 2G, i923.

hi i "l" HUGH A. moons AND ciinaiins 'J'ACOBS, or ainvn-EAronis, INNESOA.

MULTIPLE-NEEDLE nnns'rrrcnine MECHANISM;

Application m November 24, 19,20. Serial No. 4.26.266.- i 1 I To allwhom it may concern: 7

Be it known that we, HUGH A. Jnoons and Gin-nuns l l. Jnoons, citizensof the United States, residing at Minneapolis, in the county of Hcnnepinand State of Minnesota, have invented certain new and usefulImprovements .in lvilultipldNeedle ileinstitching Mechanism, and we dohereby declare the following to be a full, clear, andexact descriptionof the invention, such as will enable others skilled in the art to whichit appertains to make and use the same.

Jur invention has for its object to provide an extremely simple andhighly ellicient hemstitching attachment or mechanism for sewingmachines and more particularly for sewing machines of the rotary shuttleor rotary hook type.

Hitherto, hemstitching of special character has been done by expensivesewing machine mechanism, which, because of the expense was not adaptedfor domestic use. Our hemstitching attachment or device is adapted to beapplied either at the factory or upon machines already in use atcomparatively small cost, and, at the same time, will be highly elhcientfor the purposes had in new to enlarge and properly shape holes pieviously made by one ofthe needles. ,The two needles are arranged tothrow interlapping thread loops, that is, the thread loop from eachneedle will be thrown laterally toward the other needle, so that, in adirection transversely of the feed movement, there willbe a lapping orinterlapping of these thread loops, the one beyond the other, The rotaryhookis arranged to pass through these two thread loops from the .twoneedles and to carryfthe same around the third thread that comes fromthe shuttle, thereby forming athree-thread stitch in which twooutsidethreads, supplied from the two needles, will be interlocked with andconnected, by said third threadthat comes from the shuttle or bobbin.

The preferred embodiment of the inven tion is illustrated in theaccompanying drawings, wherein like characters indicate like partsthroughout the several views.

In the preferred embodiment of the in 'pass between the two needlespreSentlytobe Referring to thedrawings: A

Fig. l is aside elevation showing-a sew, ing machine of the rotaryshuttletype having our attachment or hemstitching-device appliedthereto, y p Fig. 2 is a front elevation of the'machinc shown in Fig.1;I I j Fig. 3 is a YltfiVlJitlllly in side elevat on, but with some partssectioned on the line 33 of Fig.2;

Fig. 4; is a fragmentary .planviewshowing the needle plate and certainassociated parts; Fig. 5' is a perspective showing the need les,piercer, presses foot, needle plate and feed teeth of the machine; Iy 1. ,i

Fig.6 is a view partly in front elevation but with some parts sectionedon theirregular line 6 -6 ofFig. 3;.

'Fig.

l is a view-corresponding to Fig. 8,

v Fig. '9 is a plan view illustrating the Lem but with the shuttleandthook in full ele- 1 Fig. 10 is an enlarged View showing the mannerin which the three threads are 1nstitching structure; and, 8

terlocked to form the stitch.

Of. the parts of the sewing machine,.,it]is desirable, for the purposesofthis case,:only

to particularly note the bed plate 11, the head arm 12, theface plate13, the needle bar .14, the presser foot b31 15, the presserv foot. y

16, the thread take-up arm l7, the thread.

tension device 18, the main-driving shaft19,

the shuttle driving forked' or two-pronged pinion 20 and the rotaryshuttle 2 1, all of which parts are of :well known construction andoperate. in -a manner. well understood:

This. ro-

by. those familiar with thisv art tary shuttle 21, as is customary, sset to roe. tate on an oblique axis within the customary shuttle race.22, and 'said shuttle has d1ametrically oppositeseats .23 with which theprongs of the driving fork or pin-ion. 20-engage through ,thelowerl-ialf rotation The shuttle 21 containsjthecustomary bobbin and Ibobbin case 24, and the bobbin c'ase has the customary cover 25,,wh1chlatter-noted parts 1 also operate in a-well known manner. Moreover, therotary shutt1e21 has a peripheral hook 21 which, ill-z this instance, 1smade very thin or-narrow and is arranged to described,

Below the presser foot 16, the needle plate 17 is shown as provided witha raised portion 17 that is formed with two perforations 26 and 27, andthe presser foot 16, as shown, is provided with perforations 28 and 29that overlie, respectively, said perforations 26' and 27. The numeral 30indicates the feed teeth that work through the needle plate in the usualway.

As already indicated, our invention contemplates the use of a pluralityof needles, and preferably also, a co-operating piercer. These twoneedles 31 andBZ and the piercer 33 are all preferably rigidly securedto and depend from a common head 34 having a shank 35 adapted to besecured to the lower end of the needle bar 14 by the customary clampinghead 1a.

The piercer 33 is located directly behind the needle 81 and is so spacedtherefrom that it will always come into a needle hole justback of thehole occupied and, in fact, primarily made by said needle 31. Thefunction of this piercer 33 is to enlarge and to better form the hole inthe cloth and, hence, said piercer, at least in its upper portion, wouldpreferably be approximately rectangular in cross section, inasmuch asthat is the form of hole ultimately desired in hemstitching.

The two needles, 31 and 32 are passed through the holes 28 and 26 of thepresser foot 16 and needle plate, respectively, while the piercer 33 ispassed through the holes 29 and 27. Threads a and b are suppliedrespectively to the needles 31 and 32. These threads, as shown, aresupplied from spools 36 and 37 mounted on the head arm'12 and said twothreads are passed through suitable guides 38, through the tensiondevice 18, through the slack take-up arm 17 and through suitable guides39 in the needle bar clamp 1 1 The lower or third thread. carried by thebobbin 2 1 is indicated by the character 0, that is manipulated insubstantially the customary way under rotation of the shuttle;

. but in this arrangement, the hook of the shuttle passes through theinterlapped, loops of the spool threads (4 and b, and, hence, both ofthe threads a and Z) are turned about said lower thread 0 and the threethreads bei come, interlocked, as best shown in Fig. 10.

Here it will be noted that the lock or third thread 0 1s alternatelyinterlocked with the threads 0; and b. Preferably,"the thread a is fedunder greater tension than the thread 6., so that when the thread 0 isdrawn taut, the thread I) will be pulled laterally toward the thread a;The thread I) will be stitched in thebody of the cloth'y, seeparticularly F1g.,9,while the thread a will be stitched into the holes 3which are made as a part of the hemstitching and are finally formed fordouble hemstitching, the stitching operation must be repeated on bothsides. For example, in Fig. 9, single hemstltchingat the right is shownas completed, but double hemstitching at the right and left is not fullycompleted in said view, Fig. 9.

Obviously, very high'grade hemstitching may be done by this attachment,especially when the stitching operation is repeated on both sides ofthe'row of perforations. The

manner of forming the stitches in the perforations and in the body ofthe cloth alongthe line of perforations and of drawing the threadsin'the stitching operation, not only definitely forms the hemstitch butprovides a hemstitch that will keep its form after it has been made.-

The fact that the needles are all on a common head is highly importantbecause they can be made in exact proper adjustment and cannotthereafter get out of adjustment, and, moreover, may be handled as asingle unit.

lVhat we claim is;

1. In a sewing machine. the combination with two needles adjacentlyconnected for simultaneous movements, a shuttle mecha nism including ahook-acting member ar= ranged to pass between said needles and throughoverlapped thread loops projected from the several needles and to carrysaid thread loops around the thread from the shuttle mechanism, and apiercer movable with said needles, one of said needles and said piercerbeing spaced in the line of the feed movement, and one thereof beingarranged to enter holes formed by the other.

' In a sewing machine, the combination with twoneedles adiacentlyconnected for simultaneous movements, shuttle mechanism including arotary hook arranged to pass between the said needles and throughoverlapped thread loops projected ,from the several needles and to carrysaid thread loops around the thread; from the shuttle, and a piercermovable into the holes formed byone of the needles and serving toenlargeand complete the formation of. the holes.

3. Two sewing machine needles and a piercer connected to a having acommon stem, said piercer being located directly beyondone of saidneedles and positioned so that it will enterholes common headandprimarily formed by said needle located in front thereof. Intestimony whereof natures.

. HUGH A. JACOBS.

CHARLES E; JACOBS.

they aiiix their sig-

